We must now consider the causes of pleasure: and under this head there are eight points of inquiry:

(1) Whether operation is the proper cause of pleasure?

(2) Whether movement is a cause of pleasure?

(3) Whether hope and memory cause pleasure?

(4) Whether sadness causes pleasure?

(5) Whether the actions of others are a cause of pleasure to us?

(6) Whether doing good to another is a cause of pleasure?

(7) Whether likeness is a cause of pleasure?

(8) Whether wonder is a cause of pleasure?